Durability performance of concrete incorporating Class F and Class C fly ashes

Uysal, Mücteba; Akyüncü, Veysel

doi:10.1016/j.conbuildmat.2012.02.075

Cited by 146 publications

(63 citation statements)

References 40 publications

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“…The differences are as follows: 84.5% when series I and I R are compared and 62.4% in case of series II and II R. Such an effect is not observed in the case of concretes made with the addition of microsilica and metakaolin, i.e. series III, III R, IV and IV R. In [38,44] similar decrease of chloride migration coefficient for natural aggregate concrete after Class-C fly ash addition was reported.…”

Section: Chloride Migration Coefficient Of Concretesupporting

confidence: 50%

Influence of SCM on the Permeability of Concrete with Recycled Aggregate

Kubissa

Jaskulski

Brodňan

2016

Period. Polytech. Civil Eng.

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The article presents experimental analysis of concretes mixed by using natural and low quality recycled concrete aggregate (RCA) Roman JaskulskiWarsaw University of Technology Branch in Płock, Poland e-mail: romanjas@pw.plock.pl Miroslav BrodnanUniversity ofZilina, Slovakia e-mail: brodnan@fstav.uniza.sk IntroductionIncreasing the use of recycled concrete aggregate (RCA) and supplementary cementitious materials (SCM) in concrete industry can considerably enhance the environmental friendliness of concrete production. The availability of natural sources of aggregates, which makes up about 60%-70% of concrete volume, is becoming more limited due to restrictions on quarrying operations and longer hauling distances. The disposal of old concrete, which remains from demolished structures, is still a problem and frequently it is deposited in the landfills [1]. So a growing trend to replace the traditional concrete constituents with more sustainable materials is increasingly present in concrete technology. Using RCA as a substitute for natural aggregates and SCM as a partial cement replacement in concrete mixtures is a way to potentially address the economic and environmental concerns. Dosho 2007 [2] wrote about papers on recycled aggregate concrete that has been published just after World War II: physical properties by Glruzhge in 1946, Russia, and the influence of mixture impurities by Graf in 1948, Germany. First detailed test results on application of the RCA in concrete technology were published by Nixon in 1978 [3]. He suggested that the main field in which more information about the behaviour of the recycled concrete is required is its durability. The studies on the application of RCA into concrete mixture have mainly concerned mix design [4,5], mechanical properties [6][7][8], structural performance [9,10] and the final purpose [11,12]. Until now many of the durability parameters have been investigated and technological recommendation and detailed requirements according to quality of RCA has been drawn [13]. It has been stated that is possible to design and prepare durable concretes by using adequately good quality RCA. The aggregate characteristics of density, porosity and water absorption are a primary focus in determining the proper concrete mixture and the required concrete properties. These characteristics should be known to limit water absorption capacity of aggregates to no more than 5% for structural concrete, and thus the proportion of RCA is often limited in concrete mixes [13,14].Most of the research concerning RCA quality and the durability of concrete mixed by using RCA has been performed in

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Section: Chloride Migration Coefficient Of Concretesupporting

confidence: 50%

Influence of SCM on the Permeability of Concrete with Recycled Aggregate

Kubissa

Jaskulski

Brodňan

2016

Period. Polytech. Civil Eng.

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“…It is well known that using FA can improve the workability of fresh concrete. Although the effects of mineral admixture on the rheological behaviors of fresh concrete and the properties of harden concrete are often studied (Fan et al 1999;Şahmaran et al 2009;Uysal and Akyuncu 2012;Cassagnabère et al 2013), and there are a few literatures about the thixotropic behavior of fresh concrete containing mineral admixtures (Assaad and Khayat 2004;Rahman et al 2014), the prediction of the fluidity's change of fresh concrete with rest time is still a problem awaiting solution.…”

Section: Introductionmentioning

confidence: 99%

Analytical Study on the Change of Fluidity of Fresh Concrete Containing Mineral Admixture with Rest time

Cao

Guo

2017

ACT

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Supplementary cementitious materials, such as fly ash (FA) and ground granulated blast furnace slag (BFS), are usually used to replace cement for improving the properties of concrete and achieving environment-friendly concrete. In this paper, the time-dependent fluidity of fresh concrete with mineral admixture was discussed by the time-dependent Discrete Element Method (td-DEM). The effects of FA and BFS on the time-dependence were taken up. A gravity-induced funnel flow test of fresh mortar, in which FA or BFS replaced part of Portland cement, and the numerical funnel flow simulation using the td-DEM, were conducted respectively. The agreement of the numerical and experimental results indicates that the td-DEM is applied to the prediction of the change of fluidity of fresh concrete containing FA or BFS. The numerical and experimental results also show that the use of mineral admixture would decrease the rest time-dependence of fresh concrete.

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“…Additionally, use of by-product SCM, like FA and BFS, can decrease the cost of SCC and the amount of the CO 2 production related to the use of PC in concrete. Therefore, use of SCM has become very important in SCC [6,7].…”

Section: Introductionmentioning

confidence: 99%

Thixotropy and structural breakdown properties of self consolidating concrete containing various supplementary cementitious materials

Ahari

Erdem

Ramyar

2015

Cement and Concrete Composites

111

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Supplementary cementitious materials Thixotropy Breakdown Drop in apparent viscosity Yield value at rest a b s t r a c tIn this study, thixotropy and structural breakdown of 57 self-consolidating concrete (SCC) mixtures containing various supplementary cementitious materials (SCM) were investigated by different approaches. The effects of SCM type and content on high range water reducer demand and plastic viscosity were also studied. For these purposes, various amounts of silica fume (SF), metakaolin (MK), Class F fly ash (FAF), Class C fly ash (FAC) and granulated blast-furnace slag (BFS) were utilized in binary, ternary, and quaternary cementitious blends in three water/binder (w/b) ratios. Results showed that except BFS, use of SCM in SCC mixtures increased thixotropy values in comparison with the mixtures containing only portland cement (PC). Good correlations were established between structural breakdown area and drop in apparent viscosity values for all w/b ratios. The different methods used to evaluate the thixotropy and structural breakdown got more consistent with each other as w/b decreased.

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Durability performance of concrete incorporating Class F and Class C fly ashes

Cited by 146 publications

References 40 publications

Influence of SCM on the Permeability of Concrete with Recycled Aggregate

Influence of SCM on the Permeability of Concrete with Recycled Aggregate

Analytical Study on the Change of Fluidity of Fresh Concrete Containing Mineral Admixture with Rest time

Thixotropy and structural breakdown properties of self consolidating concrete containing various supplementary cementitious materials

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